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Type1 Type2
ÁÂÇ¥¸¦ ¾Ë°í ÀÖ´Â ¼¼ Á¡ P1(x1, y1), P2(x2, y2), P3(x3, y3) °¡ ÀÖ°í °¢ Á¡¿¡¼­ ÀÓÀÇÀÇ Á¡ A(x, y) ±îÁöÀÇ °Å¸®°¡ °¢°¢ d1, d2, d3 ÀÏ ¶§, Á¡ AÀÇ ÁÂÇ¥¸¦ ±¸ÇÑ´Ù.

Á¡ P1°ú Á¡ A »çÀÌ¿¡´Â ´ÙÀ½°ú °°Àº °ü°è½ÄÀÌ ¼º¸³ÇÑ´Ù.

d1 = ((x-x1)^2+(y-y1)^2)^(1/2)

d1^2 = (x-x1)^2+(y-y1)^2
   
    = x^2-2*x1*x+x1^2 + y^2-2*y1*y+y1^2

¨ç x^2-2*x1*x + y^2-2*y1*y = d1^2 - x1^2 - y1^2 = C1

À̸¦ P2¿Í A, P3¿Í A¿¡ µ¿ÀÏÇÏ°Ô Àû¿ëÇϸé, ´ÙÀ½ µÎ ½ÄÀ» ¾òÀ» ¼ö ÀÖ´Ù.

¨è x^2-2*x2*x + y^2-2*y2*y = d2^2 - x2^2 - y2^2 = C2

¨é x^2-2*x3*x + y^2-2*y3*y = d3^2 - x3^2 - y3^2 = C3

¨è - ¨ç = ¨ê Çϸé,

¨ê 2*(x1-x2)*x + 2*(y1-y2)*y = C2-C1

¨é - ¨ç = ¨ë Çϸé,

¨ë 2*(x1-x3)*x + 2*(y1-y3)*y = C3-C1

ÀÌ µÈ´Ù.
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y¸¦ ¼Ò°ÅÇϱâ À§Çؼ­ ¨ê - ¨ë*(y1-y2)/(y1-y3) = ¨ì À» Çϸé,

¨ì 2*(x1-x2)*x - 2*((x1-x3)*(y1-y2)/(y1-y3))*x = (C2-C1)-(C3-C1)*(y1-y2)/(y1-y3)

  2*((x1-x2)-(x1-x3)*(y1-y2)/(y1-y3))*x = (C2-C1)-(C3-C1)*(y1-y2)/(y1-y3)

  x = ((C2-C1)-(C3-C1)*(y1-y2)/(y1-y3))/(2*((x1-x2)-(x1-x3)*(y1-y2)/(y1-y3)))

    = ((C2-C1)*(y1-y3)-(C3-C1)*(y1-y2))/(2*((x1-x2)*(y1-y3)-(x1-x3)*(y1-y2)))

ÀÌ µÈ´Ù.

x ¸¦ ¼Ò°ÅÇϱâ À§ÇØ ¨ê - ¨ë*(x1-x2)/(x1-x3) = ¨í À» Çϸé, µ¿ÀÏÇÑ ¹æ¹ýÀ¸·Î,

¨í 2*(y1-y2)*y - 2*((y1-y3)*(x1-x2)/(x1-x3))*y = (C2-C1)-(C3-C1)*(x1-x2)/(x1-x3)

  2*((y1-y2)-(y1-y3)*(x1-x2)/(x1-x3))*y = (C2-C1)-(C3-C1)*(x1-x2)/(x1-x3) 

  y = ((C2-C1)*(x1-x3)-(C3-C1)*(x1-x2))/(2*((y1-y2)*(x1-x3)-(y1-y3)*(x1-x2)))

ÀÌ µÈ´Ù.

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